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Carbon dioxide extinguishes fire by cutting off the supply of oxygen. carbon dioxide being HEAVIER than AIR covers the fire and HENCE does not allow oxygen to come in the CONTACT of flame. Since oxygen is required for the combustion, unavailability of oxygen results in the quenching of fire.

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The hydrogen nucleus (it has one PROTON) was an ELEMENTARY particle. Rutherford named it the proton, from the Greek word "protos," MEANING "first." In 1932, James Chadwick, an English PHYSICIST who had worked with Rutherford, detected NEUTRONS and measured their mass in an invisible game of billiards.

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An Ideal fuel has following characteristics:

It is READILY available,

It is less expensive,

It BURNS easily in air at a moderate rate,

It produces a large AMOUNT of heat,

It can transport easily.

It has high calorific value, and.

It does not LEAVE behind any undesirable substances.

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3-methyl- octanol

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Given the formula F6H2Si, is it POSSIBLE to CALCULATE the PKA, or can this only be worked out by EXPERIMENT?

They can form an alloy.
AS FAR as I REMEMBER only (Na4Ba) alloy SHOW separate PHASE.

Explanation:

Orientation of mono substituted benzene compounds towards electrophilic substitution REACTIONS will be:

• If the group present on the benzene ring is electron-donating group than the incoming electro-phile will attack on the para and ORTHO POSITION of the mono substituted benzene ring. This is because the electrons donated by electron-donating group are in conjugation with the benzene ring which will GENERATE negative charge on ortho and para positions of the mono-substituted benzene ring. as shown in the image attached

• If the group present on the benzene ring is electron-withdrawing group than the incoming electro-phile will attack on the meta position of the mono substituted benzene ring. This is because the electrons withdrawing group will withdraw the electron density of the ring by  which positive charge will be on ortho and para positions on the mono-substituted benzene ring. Since, the ortho and para positions are electron deficient only meta position will be rich in electron density. Hence, electrophile will attack on meta position of the mono-substituted benzene ring. As shown in the image attached.

(i) Plaster of pairs / Calcium SULPHATE hemihydrate having chemical formula CaSO4 .1/2 H2O is a form of gypsum calcium phosphate. To make casts and molds, it is mixed with water. A hard plaster made when mixed with water: a completely HYDRATED form of calcium sulphate.

A white POWDER that becomes hard solid when mixed with water, used for the production of sculptures and casts, as an additive for lime plasters and for the production of casts for BROKEN limbs.

(ii) Its equation for PREPARATION is CaSO4.2H20 --Heat(373K)- > CaSO4 .1/2 H2O + 1(1/2) H2O  

(iii) Used as a plaster for supporting fractured bones.. Used for making toys / statues / decorative items.-

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Filtration is any of VARIOUS MECHANICAL, physical or biological operations that separate solids from fluids (liquids or GASES) by adding a medium through which only the fluid can pass. The fluid that passes through is called the filtrate.[1] In physical filters oversize solids in the fluid are retained and in biological filters particulates are trapped and ingested and metabolites are retained and removed. However, the separation is not complete; solids will be contaminated with some fluid and filtrate will contain fine particles (depending on the PORE size, filter thickness and biological ACTIVITY). Filtration occurs both in nature and in engineered systems; there are biological, geological, and industrial forms. For example, in animals (including humans), renal filtration removes wastes from the blood, and in water treatment and sewage treatment, undesirable constituents are removed by absorption into a biological film grown on or in the filter medium, as in slow sand filtration.

First you converted % into gram
then you will FIND the no of MOLE of each atom
by COMPARISON there RATIO you find emperical formula

I THINK that is BASIC and saltly in nature.
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The ACTINOID contraction less imp than LANTHANOID contraction because actinoid contraction is greater from element to element than lanthanoid.

The compounds with small BOND angles are optically more stable because it can relieve some of the bond STRAIN by buckling the ring and pushing ONE carbon out of the PLANE.

The MECHANICAL and chemical properties is important for nanofluid PHYSICAL properties of nanofluids for HEAT are PRESENT ADVANTAGES over the conventional.

The equilibrium CONSTANT CHANGE when a reaction is MULTIPLIED because equilibrium constant shows that the reaction that wants to get complete the carbon.

The activity of coefficient of H+ in a SOLUTION CONTAINING 0.017m HCL and 0.011m is burning GAS.

Peroxymonosulfuric acid also KNOWN as persulfuric acid, peroxysulfuric acid or caro's acid is a LIQUID at room temperature. SOMETIMES confused with known as peroxydisulfuric acid.

2m GLUCOSE SOLUTION will have HIGHER BOILING point

Current flows more easily in salt water than it does in fresh water. This is because salt water, an electrolyte solution, contains more dissolved IONS than fresh water, meaning electrons can MOVE more easily. Since rusting is all about the movement of electrons, iron rusts more quickly in salt water than it does in fresh water. Certain metal objects that spend a lot of time submerged in salt water, such as boat engines, rust quickly. However, objects do not have to be completely submerged in salt water for this to happen because increased moisture in the air and salt spray can provide the electrolyte's cation (positive ions) and anions (negative ions).

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There are 1 ATOM of OXYGEN and 11 MOLECULES of oxygen

I didn't UNDERSTAND this QUESTION

It is very simple. first dip the red litmus paper in three test tube separately. basic solution can change the colour of red litmus into blue while acids can change the colour of blue litmus into red.
one of the litmus paper CHANGES to blue out of three litmus PAPERS dipped in three test tubes. so that is base solution. then you are left with acid and WATER.
now you have Blue litmus paper (red litmus paper dipped in base). deep in 2 other test tubes. 1 out of two changes the colour change of blue litmus into red that is acid solution. and the remaining one is water.

17-chlorine is more reactive SINCE the SEVENTH group ELEMENTS are more reactive than sixth group and they POSSESS more electron affinity

You can USE NaNO2/HCl in place of cu for the formation of BDC from ANILINE...

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Now, as positive and negative attract vigorously, the two elements combine (one magnesium atom and twochlorine atoms) to FORM the compoundmagnesium chloride, that is MgCl2. This is an IONIC bond FORMED by the donation and acceptance of electrons, and each of the atoms have charges.
When nacl mixed with water it breaks into na+ cl- IONS which conducts electricit but solid nacl has no FREE mobile ions

A chemical EQUATION:



☆tells us about the actual RESULT of the chemical change

☆about the no. of molecules of each substance taking part

☆about the chemical composition of the respective molecules

☆about the molecular mass

☆also proves the LAW of conservation of mass




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It is USED to REDUCE the TEMPERATURE of the REACTION

• CH3CH2CHO(propanal)[Family of ALDEHYDE]
• CH3-CO-CH3(PROPANONE)[Family of KETONE]

The method uses a very large molecule called EDTA which forms a complex with calcium and MAGNESIUM ions. ... The dye–metal ion complex is less stable than theEDTA–metal ion complex. For the TITRATION, the sample solution containing the calcium and magnesium ions is reacted with an EXCESS of EDTA

A GROUP of atoms responsible for the CHARACTERISTIC reactions of a PARTICULAR COMPOUND.
eg:hydrophobic group , hydrophilic functional group

This ZONE consists of unburnt wax vapour given the MOLTEN wax. it is the COLDEST PART of the flam.

A non-luminous flame undergoes COMPLETE combustion as it DRAWS much more oxygen and gets much hotter. There are several "zones" within a non-luminous flame, and each zone has a different temperature. The OUTERMOST zone of the flame is blue in COLOUR and it is the hottest part. This is due to complete combustion.

I THINK it is FLOURINE
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B) calorific VALUE!
calorific value is the amount of energy released when 1KG of fuel UNDERGOES COMPLETE combustion. It's unit is joules per kg. More the calorific value, more efficient the fuel.
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DEAR STUDENT

Since tellurium has the properties of both METALS and non-metals it is called a METALLOID..........

ADDITIONAL INFORMATION

symbol of tellurium is Te and atomic number is 52........... It is a mildly toxic, brittle, RARE, silver-white metalloid.............

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X-Iron
y-hydrochloric ACID (HCL)
z-hydrogen

It is YELLOW -GREEN in COLOUR.

The FORMATION of ammonia doesn't requires any ENERGY to SUPPLIED as delta h is -ve which symbolises energy is released..that's why normal temp or room temp. is enough.This process of formation of ammonia is also CALLED Haber process..U can also have LOOK for haber process in Google...